CHEMICAL REACTION ENGINEERING QUIZ

For the non-catalytic reaction of particles with surrounding fluid, the time needed to achieve the same fractional conversion for particles of different but unchanging sizes is proportional to the square of particle diameter, when the __________ is the controlling resistance.

Diffusion through ash layer

Either A, B or C

Film diffusion

Chemical reaction

TRUE ANSWER : ?
YOUR ANSWER : ?

If the time required for half change is inversely proportional to the square of initial concentration and the velocity depends on the units in which the concentration term is expressed, then the order of reaction is

2

1

3

0

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following will favour the reverse reaction in a chemical equilibrium reaction?

Increasing the concentration of one or more of the products

None of these

Removal of at least one of the products at regular interval

Increasing the concentration of one of the reactants

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following resistances is not involved in a gas phase catalytic (gas- solid) reaction?

Gas film and pore surface diffusion resistances for products

Gas film and pore surface diffusion resistances for reactants

Ash resistance

Surface phenomenon resistance

TRUE ANSWER : ?
YOUR ANSWER : ?

When a high liquid hold up is required in a reactor for gas liquid reaction, use __________ coloumn.

Packed

Tray

Bubble

Spray

TRUE ANSWER : ?
YOUR ANSWER : ?

Consider the 'n' th order irreversible liquid phase reaction A → B. Which one of the following plots involving half life of the reaction (t1/2) and the initial reactant concentration (CA0) gives a straight line plot?

Ln CA0 Vs ln t1/2

CA0 Vs ln t1/2

CA0 Vs t1/2

Ln CA0 Vs t1/2

TRUE ANSWER : ?
YOUR ANSWER : ?

The percent conversion of ethanol in the reactor is

95

100

2.5

97.5

TRUE ANSWER : ?
YOUR ANSWER : ?

Molecularity of a reaction

Both B and C

Is always equal to the overall order of reaction

Can

May not be equal to the order of reaction

TRUE ANSWER : ?
YOUR ANSWER : ?

Pure A in gas phase enters a reactor 50% of this A is converted to B through the reaction, A 3B. Mole fraction of A in the exit stream is

43833

43832

43835

43834

TRUE ANSWER : ?
YOUR ANSWER : ?

The rate of the chemical reaction A → B doubles as the concentration of A i.e.., CA is doubled. If rate of reaction is proportional to CAn, then what is the value of n for this reaction?

2

1

0.5

TRUE ANSWER : ?
YOUR ANSWER : ?